From owner-freebsd-hackers Sat Dec 4 9:55:16 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id 8850B14C37; Sat, 4 Dec 1999 09:55:05 -0800 (PST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.9.3/8.9.3) with ESMTP id KAA28862; Sat, 4 Dec 1999 10:52:45 -0700 (MST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.3/8.8.3) with ESMTP id KAA21366; Sat, 4 Dec 1999 10:52:45 -0700 (MST) Message-Id: <199912041752.KAA21366@harmony.village.org> To: mjacob@feral.com Subject: Re: tty level buffer overflows Cc: Mike Smith , hackers@FreeBSD.ORG In-reply-to: Your message of "Sat, 04 Dec 1999 09:36:30 PST." References: Date: Sat, 04 Dec 1999 10:52:45 -0700 From: Warner Losh Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message Matthew Jacob writes: : Normally I might agree with this, but I use a tty line on a 150Mhz i386 to : be a serial console for another freebsd box. This is a NS16550A with a 16 : byte fifo. This systems is effectively idle except for this task. So, I'm : running tip and I get constant tty-level buffer overflows at 9600 baud. In the past, something like TTYHOG has been used to arbitrate this, but I can't seem to find the right magic bits here. Pointers? I am seeing this at 115200 on my 486DX2-66 for my ISDN line. NS16550A uarts. Everything else seems cool. I am suspecting a subtle bug because it only happens now and again, not all the time, or only when large xfers are happening. I'd like to know more about this resource shortage so I might do something about it. Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message